I updated my M4 Mac Mini to Tahoe 26.0 2 days ago. Ever since my Time Machine backup has been failing. I've been using a My Passport for Mac - Mac OS Extended (Journaled) - for years to do this. The 4 Tb drive has just over 1 Tb of available space. I turned off Bitdefender Antivirus for Mac, but the backup still fails. I turned off NordVPN, but the backup still fails. Any help would be much appreciated.
I was finally able to get Time Machine working again. I noticed that there was a warning message within Bitdefender Antivirus for Mac:
Feature: Anti-Ransomware
An unauthorized app attempted to access your backups.
App: /System/Library/CoreServices/TimeMachine/backupd
We blocked the app to prevent it from altering the content of your backups.
Even though I had turned off Bitdefender Shield, a switch to turn on Time Machine Protection remained on ,so I turned it off. The backup ran for over 8 hours. Hopefully this will help others in a similar situation.
Thanks for everyone's efforts to help.
I was finally able to get Time Machine working again. I noticed that there was a warning message within Bitdefender Antivirus for Mac:
Feature: Anti-Ransomware
An unauthorized app attempted to access your backups.
App: /System/Library/CoreServices/TimeMachine/backupd
We blocked the app to prevent it from altering the content of your backups.
Even though I had turned off Bitdefender Shield, a switch to turn on Time Machine Protection remained on ,so I turned it off. The backup ran for over 8 hours. Hopefully this will help others in a similar situation.
Thanks for everyone's efforts to help.
badgerszk wrote:
I updated my M4 Mac Mini to Tahoe 26.0 2 days ago. Ever since my Time Machine backup has been failing. I've been using a My Passport for Mac - Mac OS Extended (Journaled) - for years to do this. The 4 Tb drive has just over 1 Tb of available space. I turned off Bitdefender Antivirus for Mac, but the backup still fails. I turned off NordVPN, but the backup still fails. Any help would be much appreciated.
I would erase/reformat/initialize the drive as new— and start anew if you have an issue.
The macOS likes to see GUID/ APFS — maybe you get away with " Extended (Journaled)" on a rotating HDD(?)
Disk Utility>View>Show All Device you are addressing the (top most) parent drive.
Erase and reformat a storage device in Disk Utility on Mac
Erase and reformat a storage device in Disk Utility on Mac - Apple Support
After I upgraded to Tahoe 26.0 on my M4 Mac mini Pro, I formatted a new 2 TB Crucial X9 SSD as APFS, and assigned that as the new Time Machine backup drive. TM continues to work flawlessly every hour. I have been using APFS formatted Time Machine drives since Catalina (on multiple Intel and Apple Silicon Macs) without any issues or lost backups.
M4 Mac Mini Time Machine Fails After Upgrade to Tahoe 26.0
